Parallel Coordinate Diagram

I have a use case for Datashader to produce a Parallel Coordinate Diagram (https://en.wikipedia.org/wiki/Parallel_coordinates) for ~100 million independent N - Dimensional vectors. My current dataset stores each of the N-dimensions as a separate column in a DataFrame. I was hoping the interface would allow for easy reordering of the columns.

I have attempted to implement a Parallel Coordinate glyph very similar to the line glyph, but my implementation is not running as efficiently as I'd like.

I have a couple of questions:
- Am I missing an easy way to generate a Parallel Coordinate Diagram with the existing Datashader interface? (hoping to have efficiency similar to N * line efficiency)
- Is there any recommendations to help improve efficiency? See the attached file Line2 glyph for my first attempt.
[glyphs.txt](https://github.com/bokeh/datashader/files/756424/glyphs.txt)

Feel free to follow up with questions.

Thank you for you help,
Justin